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Ok so just thinking here and it's later than clock indicates.... I referred to the AOS in the basic term as a pressure regulator which is correct, it is attempting to regulate the crankcase pressure at idle to about neg 4.4" wc. Since the plug is missing on bank 2, the AOS "sees" this as positive pressure in the crankcase and opens in an attempt to draw it down. Since it can't with the hole open then AOS is fully open and ingesting massive quantities of oil to the intake tract. Might be worth getting all plugs back in place and test run.
EDIT: The correct term for the AOS is a diaphragm operated back-pressure regulator.
Last edited by 911monty; 11-06-2018 at 07:24 AM.
Reason: Terminology
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